I made my entire phone screen smaller by accident

[FonsworthSilverpoint]

I made my phone screen smaller, like all the pixels i could see and interact with were just smaller and to the side

1. How do i do this again

2. How do i undo this

[Piper123]

Hey there

Go to settings,
Developer Options
Minimum width

Can change it in there.

[RedXiiix]

You may have enabled One-handed Mode. You can find this in: Settings > Advanced features > One-handed Mode